Research On Virtual Modeling And Simulation Algorithm Of Rice Leaf Color

The plant virtual technology at home and abroad has become a new direction and a breakthrough of computer technology in the field of agriculture and forestry science research,in which plant leaf color change process simulation is a challenging task.To achieve rice leaf color virtual display on a computer,this article takes the leaf of 'Jinyou 458' and 'Zhongjiazao 35' which are promoted in agriculture as the object of this study.The following specific research work is carried out:According to the relation that relative chlorophyll content SPAD value of the rice changes with the auxiliary heat product TEP in the reproductive process,this article continuously tracks the SPAD value measured in rice leaves under normal state,establishes the change curve of SPAD value of a leaf positions with the growth process its various parts.Follow conclusion is found from the study: leaf apex SPAD<leave SPAD<leaf base SPAD.It is also found: the relative chlorophyll content SPAD value of rice leaf has a strong relation with TEP value,based on which a mathematical relational expression between TEP and SPAD is proposed.By the light temperature to give in real life we can easily presume the content of rice leaf SPAD according to this expression.According to the conclusion that nitrogen fertilizer application rate as a direct impact on rice SPAD value,four sets of experiments were conducted according to nitrogen content(no fertilizer,bottom nitrogen,Nitrogen,high nitrogen).In the comparative analysis of correlation coefficient between growing process and leaf color R,G,B,at the same nitrogen fertilizer,it is assured: the second top position of leaf is the best leaf position for the research of physiological factors of individual rice blades.Based on these findings,a changing graph of top two rice leaf SPAD value with growth process under the condition of the same nitrogen fertilizer is established.From the graph we can find that leaf SPAD value is less affected by nitrogen content before its jointing stage,however apparently influenced as time goes on after jointing stage.This study has certain reference significance for the reduction of agricultural costs in future agriculture production.According to visual simulation based on SPAD rice leaf color proposed,Leaf color components R,G,B value are got after scanning rice leaves at different periods.After analyzing the relationship between leaf color RGB components and SPAD,we utilize excel to curve fitting,finding that RGB components and SPAD leaf of these tow rice varieties between turning green stage and heading stage take on linear relationship.According to the above linear relationship,a mathematical relationship model was set up.Combined with illumination rendering model algorithm,our author visually simulate different blade performance generated rice leaves,which may be influence by different SPAD value& different parameters.Thus we achieve a new way of integrating leaf physiological factors into lighting model,making rice leave color visually rendered.